workqueue warnings in helper code

[Dave Airlie]

>
> this showed up in drm-next on my radeon and udl drivers, I haven't
> bisected it yet, it may not even be your fault :-)
>
>  if (WARN_ON(!list_empty(&work->entry))) {
>
> is the line in the workqueue code.

As expected, reverting "drm: kms_helper: don't lose hotplug event"

stops the warnings here.

Dave.